BMW K bikes (Bricks)

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1Back to top Go down   Diesel oil for oil pump cleaning? Empty Diesel oil for oil pump cleaning? Thu Nov 04, 2021 5:35 am

tinyspuds

tinyspuds
Life time member
Life time member
I was going to run with Diesel engine oil for a few K mainly to give the starter Sprag a preventative clean. I am also planning to strip the oil/water pump as my oil pressure light started flickering at tickover a while back. At the start taking it a bit over tickover c.1000 rpm put the light out, but now I need to go to 1200rpm, suggesting its getting worse.

It occured to me that the pump might just be sludgy. Any thoughts on whether the diesel oil treatment might help in this respect too.

Maybe run a Thousand miles before deciding whether I need to strip the pump?
Cheers, Stu.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

Dai

Dai
Life time member
Life time member
Stu: I'd get under the pump and check the wire first. I had something similar right back at the start of my K ownership and found that connector was more copper carbonate than copper.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

tinyspuds

tinyspuds
Life time member
Life time member
Cheers Dai. I’m doing my pre-Dragon fettle. See you there.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

Dai

Dai
Life time member
Life time member
You were quick! It was only decided last Thursday. Note the requirement for a Covid passport.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

moriarti

moriarti
Life time member
Life time member
Hi Stu, I think running MINERAL Diesel engine oil is a good and safe way of removing the sludge that other oils cant reach. This is a good Preventative Maintenance practice. If the bike is to be stood over winter or long term storage,then change back to your normal oil. Hope this helps. Very Happy


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

caveman

caveman
Platinum member
Platinum member
Stu,
I've added 50k to one of my bricks (87 100rt) and all I ever use is 15-40 in all my bricks. Hell some times I'll go 6-7k before changing. I'm sure some would say I'm crazy and I can't argue with that.

    

92KK 84WW Olaf

avatar
Life time member
Life time member
I have a few Ks and if I use 10W40 oils the oil light flickers when the engine is hot.

I have had issue on an oil pressure sensor before and to be honest the easier task is to check the wire and possibly swap the sensor.

I have reverted to 20W50 mineral and frequent changes and it has eliminated sprag clutch issues.

As for the diesel oils, anthing rated above the K spec is good, many oils are now suitable for both petrol and diesel engines.

I have foiund the K1100 particularly liklely to have a flickering oil pressure light in hot weather on W40 oils and never put less than a 50 in it now. Even the manual for K1100 has W50, so its a manufacturing thing rather than a defect.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 40,490 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

8Back to top Go down   Diesel oil for oil pump cleaning? Empty Re: Diesel oil for oil pump cleaning? Sat Nov 06, 2021 10:49 pm

Holister

Holister
Life time member
Life time member
I think you would need to be living in extreme weather conditions to warrant using an oil outside of what BMW recommend and that's stated in the rider's manual but 10w40 in a cold climate could be ok but I wouldn't. Definitely not a good grade to use in any warmer climates. I tried 10w40 in my old K100 a few years back and it rattled like a bucket of bolts. I suspect 40 is a little too thin and the pump is having a little trouble keeping the pressure up.... that can't be a good thing.
These days 15w50 works well for me.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Diesel oil for oil pump cleaning? Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

tinyspuds

tinyspuds
Life time member
Life time member
@Dai wrote:You were quick! It was only decided last Thursday. Note the requirement for a Covid passport.
Can’t spare a second at my age lol!


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

10Back to top Go down   Diesel oil for oil pump cleaning? Empty Re: Diesel oil for oil pump cleaning? Wed Nov 17, 2021 10:18 am

tinyspuds

tinyspuds
Life time member
Life time member
Dai, Olaf. You nailed it. the lower of the two terminals was pretty mucky and a wiggly fit. Cleaned and pinched the light now flickers at 800rpm and stays out at 900. 
New filter and dino diesel change. That should give it all a good clean. Pig of a job getting the filter cover bolted back up, I couldn’t get the bolt holes to line up. I’ve changed the filter 4 or 5 times before and never noticed that the cover only fits one way. Blind luck every other time! I’ll take it cheers


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

11Back to top Go down   Diesel oil for oil pump cleaning? Empty Re: Diesel oil for oil pump cleaning? Wed Nov 17, 2021 2:47 pm

Dai

Dai
Life time member
Life time member
Goooo-ud!


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

12Back to top Go down   Diesel oil for oil pump cleaning? Empty Re: Diesel oil for oil pump cleaning? Wed Nov 17, 2021 3:14 pm

tinyspuds

tinyspuds
Life time member
Life time member
Spline lube tomorrow then all ready for the Dragon.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

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